Dual lattice: Difference between revisions
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<jsxgraph height="500" width="500" board="board" box="box1"> | <jsxgraph height="500" width="500" board="board" box="box1"> | ||
brd = JXG.JSXGraph.initBoard('box1', {boundingbox: [-5, 5, 5, -5], axis: | brd = JXG.JSXGraph.initBoard('box1', {boundingbox: [-5, 5, 5, -5], axis:false}); | ||
var b1 = brd.create('point', [4,0], {size:6, name:'', color:'blue', snaptogrid: true}), | var b1 = brd.create('point', [4,0], {size:6, name:'1', color:'blue', snaptogrid: true}), | ||
b2 = brd.create('point', [3,3], {size:6, name:'', color:'blue', snaptogrid: true}), | b2 = brd.create('point', [3,3], {size:6, name:'2', color:'blue', snaptogrid: true}), | ||
v1 = brd.create('arrow', [[0,0], b1], {strokeColor: 'black'}), | v1 = brd.create('arrow', [[0,0], b1], {strokeColor: 'black'}), | ||
v2 = brd.create('arrow', [[0,0], b2], {strokeColor: 'red'}), | v2 = brd.create('arrow', [[0,0], b2], {strokeColor: 'red'}), | ||
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var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | ||
return [b2.Y() / num, -b2.X() / num]; | return [b2.Y() / num, -b2.X() / num]; | ||
}], {strokeColor: ' | }], {strokeColor: 'black', name:"1'", withLabel:true, label:{position:'rt'}}); | ||
w2 = brd.create('arrow', [[0,0], function() { | w2 = brd.create('arrow', [[0,0], function() { | ||
var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | ||
return [-b1.Y() / num, b1.X() / num]; | return [-b1.Y() / num, b1.X() / num]; | ||
}], {strokeColor: ' | }], {strokeColor: 'red', name:"2'", withLabel:true, label:{position:'rt'}}); | ||
